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Effect of arginine modifying reagents on pigeon liver fatty acids synthetase: Evidence for the presence of essential arginine residues at the β-ketoacyl reductase and enoyl -CoA reductase domain

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Title	Effect of arginine modifying reagents on pigeon liver fatty acids synthetase: Evidence for the presence of essential arginine residues at the β-ketoacyl reductase and enoyl -CoA reductase domain

Creator	Mukherjee, Sanchita Kaliyar, Sarvagya S

Description	28-33 Pigeon liver fatty acid synthetase was inactivated by arginine modifying reagent, phenylglyoxal and 2,3 -butanedione. The inactivation of overall fatty acid synthetase was accompanied by the loss of β-ketoacyl reductase and enoyl-CoA reductase activity. The inactivation followed a pseudo-first order kinetics and sum of the second order rate constants for the two reductase reactions equaled that for the synthetase reaction. Inactivation of all three activities was prevented by NADPH or its analogs 2',5'-ADP and 2'-AMP but not by the corresponding nucleotides containing the 5'- phosphate. These results suggest that binding of NADPH to fatty acid synthetase involves specific interaction of the 2'-phosphate with the guanidine group of arginine residues at the active site of the two reductases, pH - Dependent inactivation by phenylglyoxal indicated that a group with a pk_a 7.5 is involved in the loss of enzyme activity. Stoichiometric results showed that 4 out of 164 arginine residues per enzyme molecule were essential for the enzyme activity.

Date	2012-12-28T11:36:15Z 2012-12-28T11:36:15Z 2000-02

Type	Article

Identifier	0975-0959 (Online); 0301-1208 (Print) http://hdl.handle.net/123456789/15378

Language	en_US

Rights	CC Attribution-Noncommercial-No Derivative Works 2.5 India

Publisher	NISCAIR-CSIR, India

Source	IJBB Vol.37(1) [February 2000]

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